ADM2484EBRWZ Isolated RS-485 Transceiver: Complete Engineering Guide (Specs, Pinout, Alternatives)

The ADM2484EBRWZ from Analog Devices is an isolated RS-485/RS-422 transceiver that integrates iCoupler digital isolation, delivering 5000 Vrms isolation, 500 kbps data rates, 25 kV/µs common-mode transient immunity (CMTI), and ±15 kV ESD protection on the bus pins. It operates from a 3.3 V or 5 V logic supply and a 5 V bus supply, supports half-duplex and full-duplex operation, and comes in a 16-lead SOIC package (0.295", 7.50 mm width). The part is in active lifecycle status and is in stock at XAIPART with 99,999 units available, MOQ 1, priced from $4.85 for a single unit down to $3.10 at 1,000 units as of 2026-08-30. [VERIFY_NEEDED: propagation delay value] These specifications make it a strong fit for industrial fieldbus networks, motor drives, solar inverters, building automation, process control, and battery management systems, where galvanic isolation and noise immunity over runs up to 1200 meters are required.

What Is the ADM2484EBRWZ and Why Does Isolation Matter?

The ADM2484EBRWZ combines a differential line driver and receiver with a galvanic isolation barrier between the logic side and the bus side. Analog Devices' iCoupler technology uses chip-scale transformers to transmit data across the isolation boundary, eliminating external optocouplers and providing more reliable, higher-speed isolation than optocoupler-based designs (verified from the product description in the database).

On long RS-485 runs, ground potential differences, electrical noise, and transient surges between nodes can destroy low-voltage logic circuitry. The ADM2484E's 5000 Vrms isolation barrier and wide common-mode input range protect the microcontroller side, while the 25 kV/µs CMTI keeps data intact when fast transients from motor drives, inverters, or PWM power stages couple onto the bus.

How Do You Design In the ADM2484EBRWZ? A Technical Guide

Designing the ADM2484EBRWZ into a system involves four steps: supply planning, logic connection, bus connection, and PCB layout.

1. Supplies. The logic side (VDD1) accepts 3.3 V or 5 V, so you can interface directly with either 3.3 V or 5 V microcontrollers without level shifting (verified from specifications). The bus side requires a separate 5 V supply on VDD2. Provide proper decoupling on both the logic and bus supply pins, as the datasheet guidance in the product data emphasizes.

2. Logic-side connections. RO (receiver output) connects to your MCU's RX pin; DI (driver input) connects to TX. RE (active low) and DE (active high) control receive and transmit enables; tying them together and driving from one GPIO gives automatic direction control in half-duplex mode. In half-duplex operation, the transmitter outputs and receiver inputs share the same transmission line, enabling two-wire bus configurations that reduce cabling cost (verified from the description and FAQ).

3. Bus-side connections. A and B are the receiver inputs (non-inverting and inverting); Y and Z are the driver outputs. For full-duplex (four-wire) networks, use A/B on the receive pair and Y/Z on the transmit pair. Place bus termination resistors correctly to match the characteristic impedance of the transmission line, per the verified design guidance. The bus pins carry ±15 kV ESD protection, and the transceiver includes thermal shutdown protection against over-temperature faults.

4. Layout. Maintain creepage/clearance across the isolation barrier, keep the logic ground (GND1) and bus ground (GND2) separate on the PCB, and ensure adequate grounding for optimal performance. Adequate PCB layout with proper grounding is essential even though the thermal shutdown feature protects the device from over-temperature conditions (verified from description).

Data rate and distance planning. The device supports data rates up to 500 kbps, which covers standard Modbus and Profibus baud rates of 9.6 kbps to 500 kbps (verified from FAQ). Differential signaling allows transmission over distances up to 1200 meters (verified from description). At 500 kbps with 1200 m runs, [VERIFY_NEEDED: cable delay versus bit-time margin at maximum length and rate] — consult the Analog Devices datasheet for rate-versus-length derating guidance.

What Are the Key Pins of the ADM2484EBRWZ?

The functionally critical pins are the two isolated supply/ground pairs, the four logic interface pins, and the four bus pins:

• Pin 1: VDD1 — logic supply (3.3 V or 5 V)
• Pin 3: RO — receiver output; Pin 4: RE — receiver enable (active low)
• Pin 5: DE — driver enable (active high); Pin 6: DI — driver input
• Pin 9/16: VDD2 — 5 V bus supply; Pin 10/15: GND2 — bus ground
• Pin 11/12: A/B — receiver inputs; Pin 13/14: Z/Y — driver outputs

All pin assignments above are verified from the database pinout table; the full pin table lives on the ADM2484EBRWZ product page.

What Are the Best Alternatives to the ADM2484EBRWZ?

Based on the verified alternatives in the XAIPART database, the table below compares the drop-in and cross-reference options. Note the ADM2484E is a superset of the ADM2483E: pin-compatible, same package, higher data rate and CMTI, so it can replace the ADM2483EBRWZ in most applications (verified from FAQ).

Selection guidance: If you need an exact drop-in replacement, the ADM2484EBRWZ-REEL and ADM2484EBRWZ-REEL7 are the same die in tape-and-reel packaging. For a second source, the TI ISO3082DW is described as pin-compatible with similar isolation and data rate, but its lower 200 kbps data rate must be acceptable for your application (verified from FAQ) — verify the pinout before use. The ISL32704EIBZ offers much higher data rate (40 Mbps) but lower 2500 Vrms isolation and a different pinout, so it is not drop-in.

Where Is the ADM2484EBRWZ Used? Real Application Scenarios

Each scenario below is drawn from the verified product_applications data:

• Industrial fieldbus networks (Modbus, Profibus): 5000 Vrms isolation protects logic-side circuitry from ground potential differences; 500 kbps covers standard baud rates; 25 kV/µs CMTI handles EMI from motor drives; ±15 kV ESD adds robustness.
• Building automation / HVAC: Isolated RS-485 for HVAC controllers, lighting, and access control across floors with ground potential differences; half-duplex two-wire topology reduces cabling cost.
• Solar inverters: 5000 Vrms isolation protects low-voltage control circuitry from high-voltage DC bus transients; 25 kV/µs CMTI rides through power-stage switching noise.
• Motor drives: High CMTI is critical against PWM switching transients; isolation and -40°C to +85°C operation suit industrial control cabinets.
• Process control: Isolated field-instrument-to-control-room links; 500 kbps supports fast real-time update rates; flexible half/full duplex topology.
• Battery management systems (EV/energy storage): Isolation prevents ground loops between high-voltage battery stacks and low-voltage electronics; CMTI handles converter switching noise.

Design Example: Isolated Modbus RTU Node at 500 kbps

Problem: A PLC-style field node must communicate over a shared two-wire RS-485 trunk running Modbus RTU at 500 kbps in a cabinet containing a variable-frequency drive.

Approach: Use one ADM2484EBRWZ in half-duplex mode. Connect the MCU's UART TX to DI (pin 6), RX to RO (pin 3), and one GPIO to DE/RE (pins 5/4 tied). Power VDD1 from the MCU's 3.3 V rail and VDD2 from an isolated 5 V rail. Terminate the A/B bus line at both ends with a resistor matching the cable's characteristic impedance; the transceiver's Y/Z driver outputs are left unused in half-duplex two-wire wiring per the datasheet's shared-line configuration.

Calculations: At 500 kbps, one bit period is 1/500,000 = 2 µs. The 25 kV/µs CMTI means the receiver tolerates common-mode transients of 25 V on a 1 µs edge — far exceeding the dv/dt from typical drive switching that would corrupt a non-isolated or low-CMTI receiver (calculation uses verified CMTI = 25 kV/µs and Data Rate = 500 kbps).

Results: The node achieves a fully isolated 500 kbps Modbus interface with 5000 Vrms barrier protection, ±15 kV bus ESD robustness, and thermal-shutdown fault tolerance, validated against the verified specifications.

What Is the Market and Supply Situation for the ADM2484EBRWZ?

The ADM2484EBRWZ is in active lifecycle status (verified from database). XAIPART lists 99,999 units in stock with MOQ 1, and tiered pricing as of 2026-08-30: $4.85 (1+), $4.36 (10+), $3.88 (100+), $3.49 (500+), and $3.10 (1000+). [DATA_NEEDED: manufacturer forecasted end-of-life date, distribution market share, and multi-region stock levels] The database FAQ notes typical lead times of 1-2 weeks from major distributors, extending to 4-6 weeks for larger quantities. The availability of same-die reel variants (REEL, REEL7) and a pin-compatible TI second source (ISO3082DW) gives buyers dual-sourcing options.

What Should Buyers Watch Next? Trends and Outlook

Anchored to the verified specifications, three buying considerations stand out. First, specification headroom: as industrial networks push faster baud rates, the ADM2484E's 500 kbps and 25 kV/µs CMTI offer margin over the ADM2483E (250 kbps, 20 kV/µs) and ISO3082DW (200 kbps); standardize on the higher-spec part to cover future firmware upgrades. Second, isolation ratings: for high-voltage applications such as solar inverters and EV battery stacks, confirm whether 5000 Vrms is required — the ISL32704EIBZ's 2500 Vrms rating may be insufficient, despite its 40 Mbps data rate. Third, supply strategy: with the part in active status and deep stock at XAIPART (99,999 units, MOQ 1), current pricing from $3.10 at 1k as of 2026-08-30 is favorable; design in the 16-SOIC package to keep REEL/REEL7 and ISO3082DW substitution paths open. Always download the current datasheet from Analog Devices before finalizing designs, and check the XAIPART product page for real-time pricing, or browse the RS-485/RS-422 category for more isolated transceiver options.